DMPesso

I have a 99 GS3 with 145k and im just wondering because before changing my spark plugs to NGK iridiums, im guessing the original platinum plugs were in there, i noticed when my cars cold the rpms would go a little over 1 and eventually drop down, ever since changing the plugs i dont know if its just me but i noticed my RPMS staying at 1.5 to even 1-8 almost 2 for a while until it warms up, once i put the car in drive and put it back in park its back to normal. My mechanic cleaned the throttle body which was VERY dirty, i was wondering if the cleaning or different plugs causes this or am i just paranoid? I also feel like with these plugs the car takes a tad longer to start then it did before even though i usually never have to hold the key down for more then 2 seconds before it starts. any opinions appreciated, thanks CL

GS4_Fiend

iTrader: (22)

Above 1500rpm then drops gradually

DMPesso

ok then i guess its normal.

ANTW1

I dont think thats normal. My rpms at either cold or warm start were always at 800 before a mechanic cleaned out my throttle body. Now its between 1500-2000. Then it drops back down. Sometimes lower than 800. I read somewhere on this forum that we might have to reset the tps sensor.

DMPesso

AHA I KNEW the throttle body cleaning caused the RPMs to be higher, I KNEW i wasnt seeing things I always thought it started up with the RPMS usually lower. How do we reset the TPS which is the throttle position sensor correct?

lexusben

iTrader: (3)

I think it just depends how cold the car is when you start it. On a very cold day my car will start up and rev over 1k for a bit before dropping down. However, if it is decent outside and I start the car it will rev right around 1k, then drop to around 800 rpms. I have also cleaned my TB and MAF in the past (I need to do it again this Summer).

KingNasGS4

iTrader: (22)

My car Revs @ about 1600 rpm @ a cold start.

GS4_Fiend

iTrader: (22)

It's higher now cause the passage is cleaned and before it was clogged. You should be happy that it's higher now. At normal operating temperature idle should be around 700-900 in park.

shurian

iTrader: (9)

Just did the same maintenance my rpms 1500 on cold ,try to reset your ECU

DMPesso

So 1500 RPMS on cold start is normal? because I dont think it is and I reset my ECU.

DMPesso

it even goes to like 1700 RPMs when cold.

lexybaby77

I just checked this morning and cold start for mine is 1400rpm (exactly on 2nd line after 1000). Then goes down to 1000 when I shift to drive.

YviE

iTrader: (3)

I remember my GS3 behaving oddly after changing the plugs (OE Platinums replaced by NGK Iridiums). At startup the engine would rev at 1800-2000rpm, instead of the 1200rpm usually.
I took off the throttle cable, put it back on to check whether it was seated correctly and reset the ECU. Haven't had a problem since.

DMPesso

Can you tell me how to take off my thorttle cable so I don't have to call my mechanic. Or is it something he should do?

YviE

iTrader: (3)

I don't remember exactly, but it's easy to do. Just rotate the throttle wheel so that you get some clearance on the cable. You also need to remove a bolt to get the cable out of the bracket. That's about it. It'll only take you a couple of minutes.

The cable sits on the back of the throttle body, towards the firewall.

Hope this helps.